clean up weird config accessor on data
spec that we export TRAVIS_* vars and start exporting example scripts
during specs
Merge branch 'sf-compile-sh' of github.com:travis-ci/travis-build into sf-compile-sh

Conflicts:
	lib/travis/build/data.rb
	lib/travis/build/script/ruby.rb
extract env var logic to Env and Var classes
export example scripts